How to make rigid body flying
1.Turn off gravity in the scene settings.
2.Now, add an active rigid body object and change the mass to something very small, like .003kg (this may need to be adjusted later)
3.Add a wind force field at the center of the scene (or origin of passive object) (make sure direction of wind is correct for your scene)

At this point things should be roughly working, so adjust the strength of the wind force against the mass of the active rigid body until the simulation is satisfactory.
Wind settings used in example gif are below:

Very basic example below: